Alumina ceramics with different sintering temperatures in argon atmosphere were obtained using stereolithography-based 3D printing. The effects of sintering temperature on microstructure and physical and mechanical properties were investigated. The results show that the average particle size, shrinkage, bulk density, crystallite size, flexural strength, Vickers hardness, and nanoindentation hardness increased with the increase in sintering temperature, whereas the open porosity decreased with increasing sintering temperature. No change was observed in phase composition, chemical bond, atomic ratio, and surface roughness. For the sintered samples, the shrinkage in Z direction is much greater than that in X or Y direction. The optimum sintering temperature in argon atmosphere is 1350 °C with a shrinkage of 3.0%, 3.2%, and 5.5% in X, Y, and Z directions, respectively, flexural strength of 26.7 MPa, Vickers hardness of 198.5 HV, nanoindentation hardness of 33.1 GPa, bulk density of 2.5 g/cm3, and open porosity of 33.8%. The optimum sintering temperature was 70 °C higher than that sintering in air atmosphere when achieved the similar properties.

中文翻译：

---

氩气氛中烧结温度对3D打印氧化铝陶瓷芯组织和性能的影响

使用基于立体光刻的3D打印获得了在氩气气氛中具有不同烧结温度的氧化铝陶瓷。研究了烧结温度对组织和物理力学性能的影响。结果表明，平均粒径，收缩率，堆积密度，微晶尺寸，抗弯强度，维氏硬度和纳米压痕硬度随烧结温度的升高而增加，而开孔率随烧结温度的升高而降低。在相组成，化学键，原子比和表面粗糙度方面未观察到变化。对于烧结样品，Z方向的收缩率远大于X或Y方向的收缩率方向。氩气中的最佳烧结温度为1350°C，X，Y和Z方向的收缩率分别为3.0％，3.2％和5.5％，弯曲强度为26.7 MPa，维氏硬度为198.5 HV，纳米压痕硬度为33.1 GPa，堆积密度为2.5 g / cm3，开孔率为33.8％。当达到类似的性能时，最佳烧结温度比在空气气氛中的烧结温度高70°C。